Back in bug 1437956, I didn't do that because UA Widget wasn't implemented. It would be nice to set the XML Pretty Print Shadow Root as a UA Widget Shadow Root so we are protected by various security features and assertions there.
Just uploaded my patch from another bug. I am not sure if we want to land this before the pref removal, given that if so this will become one UA Widget Shadow Root usage that cannot be turned of.
Assignee: nobody → timdream
Status: NEW → ASSIGNED
Priority: -- → P3
This is ready to land but given comment 2 let's not land it until the middle of the cycle.
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/f3ef27bf8c93 Use UA Widget in XML Pretty Print r=emilio
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